Mmm. I'm sure initial enforcement - once it comes in - is likely to be aimed at the juiciest targets, but that's not really the point.
I think I disagree with pscyclist inasmuch as I think [event entry and brevet card processing], paid for by cheque with SAE supplied, can be distinguished from [event entry, brevet card processing, and brevet card postage], paid for online at a higher price, but equally I don't think it's worth dicking around for the sake of 50p here or a quid there.